order Xiphosura


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Related to order Xiphosura: Eurypterida, Merostomata, Tachypleus
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Noun1.order Xiphosura - horseshoe crabs and extinct forms
animal order - the order of animals
class Merostomata, Merostomata - used in some classifications; includes the orders Xiphosura and Eurypterida
family Limulidae, Limulidae - horseshoe crabs